Tapping-machine



(No Model.) 2 Sheets-Sheet 1.

T. H. ERNST.

TAPPING MACHINE.

No. 333,937. Patented Jan. 5, I886:

WITNESSES INVENTOR "MT/MM S A ATTORNEY N. FEIEHS, Phuln'ulhogripher. Washington. 0. c1

(No Model.) 2 s neetsw-sneet 2. V. H. ERNST.

TAPPING MACHINE.

PatentdJa1L5, 1886.

INVENTOR ATTORNEYS.

UNITED STATES PATENT OFFlCE.

VICTOR H. ERNST, OF JERSEY CITY, NEW JERSEY.

TAPPlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 333,937, dated January 5, 1886.

Application filed December 6, 1884. Serial No. 149,647.

To all whom it may concern:

Be it known that I, VIoroR I-I. ERNST, of Jersey City, in the county of Hudson and State of New Jersey, have invented a new and ImprovedTapping-lllachine, of which the following is a full, clear, and exact description.

In the operation of tapping-machines of the ordinary construction great difficulty is experienced owing to the frequent breaking of taps, this breakage being mainly due to the foot-stock being positive ornon-yielding. This I seek to overcome in the present invention.

To that end and other ends my invention consists in the means, substantially as hereinaiter described and claimed.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a front elevation of a tappingmachine embodying my invention. Fig. 2 is an end elevation of the head-stock. Fig. 3 is an end elevation of the foot-stock and showing the devices for producing yielding pressure or elasticity therein. Fig. 4 is a View of part of the yielding devices, the elastic roller being in section. Fig. 5 is a side elevation of the tap-spindle. Fig. 6 is a longitudinal section through the head-stock. Fig. 7 is a perspective view of one of the pulleys. Fig. 8 is a perspective view of the clamp-sleeve.

.Fig. 9 is a perspective view of the sleeve which encircles the clamp-sleeve between the pulleys.

A is the bed and A its pedestal. B is the head-stock, and O the foot-stock, of the machine. D is the foot-stock spindle, of the ordinary construction, and provided with the usual work-holder, D.

The foot-stock C is split or divided longitudinally in its bearing, and is provided with the lugs F F, into which takes a screw, o to take up wear.

To relieve the foot-stock of its rigidity, I providea follower to operate in connection therewith. The said follower is composed, essentially, of a yoke, E, and its arm, E, or equivalent devices, the yoke being held on the foot-stock spindle D by the screw (1 working or taking in the lugs a a, formed on the yoke E. To the arm E is attached a T-arm, E its stein being adjustably secured in an aperture in the said arm E by the plate (N0 model.)

d and screw 0. The lower end of each arm E and E is preferably formed with a pendent stud or pin, M, upon which may be placed revolving rollers H, the latter being formed of the shouldered sleeve I and band H, of flexible material, thereon. On the threaded end of each roll is placed awasher, J, and nut K. By means of screws L or equivalent de vice the rollers H are held revolubly on the saidstuds or pins M.

To the rear part of the foot-stock 0, near its base, or in any other suitable position, is secured the guide-bar G by screws f, the said guide-bar projecting rearward and between ers have been adjusted to revolve freely on the bar G the armsare rigidly locked to place bythe bindingscrew e,working in the arm E.

The foot-stock is clamped on the bed of the machine by the dovetailed clampingsections G, that grasp the side edges of the bed, and is fastened in the desired position by the screw and lever O n.

The headstock B is preferably made in two parts or sections, B B, which are split or divided, as at WV, to form the clamping-sections V V, and, like the foot-stock, have dovetail ribs to engage the dovetail side edges of the bed, and are secured therein in alike manner.

It will readily be understood that by making the head-stock B in two parts or sections,

B B, the rear section B may be easily slid back and removed for needed repairs or adjustment by simply loosening clampscrew G The feet I) b will prevent the two main sections B B from coming too close to each other, but will leave a space between the heads of the said sectionsjust large enough to snugly ac commodate the clutclrpulleys N N without the latter being allowed to move laterally.

The spindle O is mounted in the head-stock B, and the bearing in each section B is divided or split longitudinally, and each has lug projections P 1?, into which take the screws 9, whereby the bearing may be adjusted to the tap-spindle to take up wear. The tap-spindle is provided with the usual. chuck for holding the taps.

h are annular grooves formed in the spindle O, leaving between them narrow ridges or ribs h. On that part of the spindle in which the grooves are formed the clamp-sleeve Q is secured by means of the screw j, Fig. 6, which binds in any one of the grooves h. The clampsleeve has the lugs W at its divided portion, into which lugs a screw, z, works, to further secure the clamp-sleeve to the spindle 0. On the side faces of the clamp-sleeve Q are the projections R, which engage with the pulleys.

NNare the clutch-pulleys, which are mounted loosely on the spindle O, and one of which revolves in the opposite direction by means of a crossed belt. (Not shown.) On the inner side face of each pulley N is formed an annular rib, U. Set into these ribs U, and projecting inward toward the center of the pulleys, are the clutch-pieces S, which engage with the projections R on the clamp-sleeve Q when the spindle O is moved to the right or left. Between the pulleys N is interposed a shell, T, which fits snugly over the clampsleeve Q. The object of this shell T is to prevent accidental engagement of the clampsleeve with the pulleys, and also serves to keep the said pulleys N in their relative positions.

\Vith the invention above described, the pressure of the taps on the foot-stock when the machine is in operation is received by the follower, which yields to the same sufficiently to prevent the breaking of the taps, which breakage is likely to occur when the action of the taps is met with a rigid resistance, as is the case with the ordinary machine.

Although I have set forth the preferred means of carrying out my invention, I do not limit myself to the particular construction shown and described.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a tapping-machine, the combination, with the foot-stock and its spindle, of a yielding follower fitted to the said spindle, and working against a suitable guide,and adapted to receive the pressure on said spindle, substantially as described.

2. In a tappingmachine, the combination, with the foot-stock and its spindle, of an adjustable yoke fitted to the same, and a suitable guide, substantially as described.

3. In a tapping-machine, the combination, with the foot'stock and its spindle, of an adj ustable yoke fitted to the same, and'having an arm attached to the arm of the yoke, a suitable guide, and yielding rollers on said arms, substantially as shown and described.

4. In a tapping-machine, the combination, with the foot-stock and its spindle, of a suitable guide, and the yoke E, having an arm, E, the arm E and the rollers H, consisting of the shouldered sleeves I and flexible bands H, substantially as described.

5. In a tapping-machine, the combination, with the foot-stock and its spindle, of a suitable guide, the yoke E, having arm E, the arm E adj ustably secured to the arm E, the rollers H, consisting of the shouldered sleeves I and flexible bands H, and of means for diametrically adjusting the rollers H, substantially as described.

6. In a tappingmachine, the combination, with the foot-stock and its spindle, of the yoke E, having arm E, the T-arm E", the stem of which is held in an aperture of the arm E, the plate d, screw cgand a suitable guide, substantially as described.

7. The combination of the clampsleeve Q, having projections R on its side faces, and the pulleys N, having clutch-pieces S, substantially as described.

8. The combination, with the clamp-sleeve Q, having projections R on its side faces, and having a binding-screw,j, of the pulleys N, having removable clutch-pieces S, substantially as described.

9. The combination,with the tap-spindle,of

a clamp-sleeve mounted thereon, said clampsleeve adapted to engage the clutch-pulleys,

and having a binding-screw which binds on the tap-spindle, substantially as described.

10. The combination,with the clamp-sleeve and clutch-pulleys,of a case or shell encircling the clamp-sleeve, substantially as and for the purpose specified.

11. The combination of the clamp sleeve having projections on its side faces, the pulleys having clutch-pieces to engage the clampsleeve, and a shell or case surrounding the clamp-sleeve, substantially as described.

12. The combination,with the pulleys having removable c1utch-pieces,of a clamp-sleeve having projections on its side faces adapted to engage the clutch-pulleys, and a shell encircling the clamp-slceve between the pulleys, substantially as described.

VICTOR H. ERNST.

W'itn esses:

EDGAR TATE, XVM. XV. LUYSTER. 

